Re: [racket-users] DrRacket: Laggy when rendering images as results vs display-ing

[Robby Findler]

I've pushed a fix that reorders the cases in the code that handles
printing so that you should see similar performance for these two now.
I'm not completely confident in the change but let me know how it
works for you.

Robby

On Sat, May 14, 2016 at 4:41 PM, Daniel Prager
<daniel.a.pra...@gmail.com> wrote:
> Displaying bitmaps in DrRacket using 2htdp/image is near instantaneous when
> (display)-ed, but takes quite a while when shown as a result.
>
> The effect gets very bad when lots of images are combined with (beside) and
> (above), while (display)-ing remains fast.
>
> Racket version is 6.5.
>
> Dan
>
>
>
> Sample comparison:
>
> displayln: 1 milliseconds
> result: 714 milliseconds
>
>
> Code:
>
> #lang racket
>
> (require 2htdp/image)
>
> (define harpos (bitmap/url
> "http://3.bp.blogspot.com/-_PE5YujeDKk/VcP3vpTgJZI/AAAAAAAAGpE/97T8sdMj6CE/s640/harpo-tryptych.png";))
>
> (define a (current-milliseconds))
> (displayln harpos)
> (define b (current-milliseconds))
> (~a "displayln: " (- b a) " milliseconds")
>
> (define c (current-milliseconds))
> harpos
> (define d (current-milliseconds))
> (~a "result: " (- d  c) " milliseconds")
>
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